If you'll notice our stickied threads in the diamond section, you can find great information there.
Such as:
Most interesting free Diamond apps Downloads here
Other than that I'd suggest not putting games on there unless it comes from the marketplace but that's just me. You never know if the games have a bad link or file and it could really mess up the phone.
Be sure to get the
marketplace from here to get your apps safely!
Maybe others can help more, my minds going blank now.